[chore] [pdata] Avoid allocations when copy oneOf fields

[dmitryax]

Similar to #13290, for oneOf fields

[codecov]

Codecov Report

❌ Patch coverage is 79.66102% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.44%. Comparing base (467db83) to head (c77c886).
⚠️ Report is 153 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/pmetric/generated_exemplar.go	50.00%	6 Missing ⚠️
pdata/pmetric/generated_numberdatapoint.go	50.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (79.66%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13291      +/-   ##
==========================================
- Coverage   91.46%   91.44%   -0.03%     
==========================================
  Files         536      536              
  Lines       29590    29625      +35     
==========================================
+ Hits        27065    27090      +25     
- Misses       1994     2004      +10     
  Partials      531      531              

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[dmitryax]

contrib tests are fixed in open-telemetry/opentelemetry-collector-contrib#40978

[dmathieu]

Should the new code path be tested?

[dmitryax]

It's actually already covered. We just don't test every option for the primitive oneOf's. In copyOrigExemplar, we cover otlpmetrics.Exemplar_AsInt case. In copyOrigNumberDataPoint, we cover otlpmetrics.NumberDataPoint_AsDouble

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.